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Considering your knowledge of both the OSI and TCP/IP models – select the following statement which you consider to NOT be true.

A. The TCP/IP Application layer maps to 2 of the OSI Layers
B. The top layer in the OSI model is named the Application layer
C. The TCP/IP Application layer maps to 3 of the OSI Layers
D. The top layer in the TCP/IP model is named the Application layer

Answer: A

Explanation:
The OSI model is a 7 layered model. The TCP/IP model is a 4 layered model. The top layer in both models is called the Application layer. The TCP/IP Application layer maps to the top 3 OSI layers (Application, Presentation, and Session layers).
Reference:
https://en.wikipedia.org/wiki/OSI_model
Question: 2

From the following options, select the answer that correctly describes the implementation of the HTTP protocol

A. By definition, HTTP is a connection-less oriented protocol and therefore utilises TCP
B. By definition, HTTP is a connection orientated protocol and therefore utilises TCP
C. By definition, HTTP is a connection-less oriented protocol and therefore utilises UDP
D. By definition, HTTP can be configured to be either connection or connection-less oriented – by specifying the appropriate HTTP header.

You have just provisioned a new VPC a with a CIDR block of 172.16.12.0/24. The entire CIDR block is fully utilised by subdividing it into 6 subnets, we will refer to these as Subnet1 through to Subnet6. The first 2 subnets (Subnet1 and Subnet2) are the same size. The last 4 subnets (Subnet3, Subnet4, Subnet5, Subnet6) are also the same size. Subnet5 is half the size of Subnet2. The address space as occupied by the first two subnets is contiguous, as is the address space occupied by the last 4 subnets. Within Subnet3 AWS reserves the address 172.16.12.129 for the VPC router. Select the correct IP address reserved by AWS for DNS in the Subnet2.

A. 172.16.64.1
B. 172.16.64.65
C. 172.16.12.66
D. 172.16.12.64

Answer: C

Explanation:
From the documentation above – we know AWS reserves the address x.x.x.1 for the VPC router, and x.x.x.2 for DNS from within each subnet. This question states that Subnet 3 reserves 172.16.12.130 for the VPC router. Given that we now know that the Subnet3 (the 1st of the last 4 Subnets) starts at 172.16.12.128 – then it must follow that Subnet2 ends at 172.16.12.127. From here we know we have 128 addresses that are halved evenly between Subnet1 and Subnet2 – 128/2 = 64 or /26 in CIDR form. Therefore it follows that the address reserved by AWS for DNS in the Subnet2 must be 172.16.12.66
Reference:
http://docs.aws.amazon.com/AmazonVPC/latest/UserGuide/VPC_Subnets.html

Question: 4

Select the VPC Peering statement below that is NOT true

A. VPC peering supports transitive peering relationships for IPv6 traffic but not IPv4
B. VPC peering can be performed between VPCs in different AWS accounts in the same region
C. TCP connections can be performed between peered VPCs
D. UDP connections can be performed between peered VPCs

Explanation:
We know by definition that Jumbo Frames support 9000 byte MTU – therefore Answer 1 is incorrect (the stated unit is kilobytes). Jumbo Frames is a data transmission unit configuration option – it does not change or alter anything related to security – therefore Answer 2 is incorrect. Answer 3 is correct – we can get improved application performance when used within appropriate scenarios. Jumbo Frames are not supported over VPG IPsec VPN connections – therefore Answer 4 is incorrect. Answer 5 is nonsensical – Jumbo Frames is a networking construct and has nothing to do with disk storage.
Reference:
http://docs.aws.amazon.com/AWSEC2/latest/UserGuide/network_mtu.html

Question: 6

You are the AWS cloud architect and have been tasked with designing an appropriate subnetting design for your production VPC. Your production VPC requires secure communications back to the corporate private network. Quality of Service (QoS) is very important 24×7 for this particular connection, as real-time data is passed continually backwards and forwards between your on-prem bioinformatics enterprise application, and the number crunching servers deployed in the cloud. Any potential latency incurred on this connection will have a direct impact on the company’s ability to attract investors and expansion into new markets. Select the correct network configuration that best facilitates your company’s continued growth plans.

A. Provision a Direct Connect connection – between your service provider’s data center and the AWS region that your cloud compute resources exist in . Configure just a Private Virtual
Interface. As this is a Direct Connection, a Virtual Private Gateway is not required
B. Configure a site-to-site layer 2 software router using OpenVPN within your VPC and ensure that QoS enabled – this is a secure and cheap option
C. Configure a site-to-site layer 3 software router using OpenVPN within your VPC and ensure that QoS enabled – this is a secure and cheap option
D. Provision a Direct Connect connection – between your existing service provider’s data center and the AWS region that your cloud compute resources exist in. Configure a Virtual Private Gateway and Private Virtual Interface